How To Judge The Reliability of Flange Manufacturer's Product Quality?

Reliable flange manufacturer usually has mature production processes and technologies, strict quality control systems and perfect testing methods. They will strictly screen raw materials to ensure that the materials used meet relevant standards and requirements. During the production process, processing and assembly are carried out in strict accordance with process specifications to ensure the accuracy and sealing performance of the products. In addition, these manufacturers will also conduct comprehensive product testing to ensure that each flange has undergone strict quality control to meet the needs and requirements of users. So how to judge whether the product quality of flange manufacturers is reliable?

‌Judgment of whether the product quality of flange manufacturers is reliable can be carried out from the following aspects:

‌1. Appearance inspection

The surface of high-quality flanges should be smooth, free of defects such as cracks, burrs, bubbles, corrosion and rust. The forging surface should be smooth and free of defects such as forging scars and cracks; the machined surface should also be free of burrs, harmful scratches, etc.

In addition, neat appearance, no damage, no rust and other phenomena are also important characteristics of high-quality flanges.

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2. Dimension measurement‌

Use measuring tools such as vernier calipers, straight rulers, depth calipers, etc. to measure the key dimensions of the flange, including inner diameter, outer diameter, thickness, bolt hole diameter and hole spacing. These dimensions must be strictly inspected according to the drawings or relevant standards to ensure the dimensional accuracy of the flange. ‌

3. Material and chemical composition analysis

Analyze the chemical composition of the flange material through a spectrometer (such as X-ray fluorescence spectrometer, emission spectrometer) to ensure that it meets relevant standards and design requirements. The chemical composition of the material directly affects its mechanical properties and corrosion resistance. ‌

4. Nondestructive testing‌

Use ultrasonic flaw detectors, X-ray imaging technology, magnetic particle flaw detection and penetration testing to detect defects inside and on the surface of the flange, such as cracks, inclusions, pores, etc. ‌

5. Pressure test‌

Before leaving the factory, the manufacturer will perform a pressure test on the flange to ensure that the product is qualified before it is put into the hands of customers. Before the pressure test, the air in the pipe should be removed and water should be filled for infiltration. After the test pipe section is filled with water, it should be fully immersed under the condition of not more than the working pressure before the pressure test. Check whether there is leakage at the joint connection, and observe whether the pressure drop meets the standard within the specified time.

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6. Hardness test

For sealing rubber rings with certain hardness requirements, hardness tests can be carried out to ensure that their hardness meets the national requirements.

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7. Manufacturer's qualifications and reputation

Choose products from manufacturers with production qualifications, consider the brand influence of the products, and purchase flange products with good brands; pay attention to contacting after-sales to understand whether there is quality assurance. In addition, flange heads produced by well-known and reputable manufacturers are usually more guaranteed in quality.

Summary

Judgement of flange quality requires many aspects, including checking whether the appearance is smooth and defect-free, measuring the dimensions to ensure compliance with the standards, analyzing the chemical composition of the material, using non-destructive testing to check internal and surface problems, conducting pressure tests to see if there are any leaks, and performing hardness tests on sealing rubber rings with requirements. At the same time, pay attention to the manufacturer's qualifications and reputation, and choose products from reliable manufacturers.